import java.sql.*;

public class DBTest {
    public static void main(String[] args) {
        // 1. 数据库连接信息 (URL, 用户名, 密码)
        String url = "jdbc:mysql://localhost:3306/library_management?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root"; // 你的数据库用户名
        String password = "liyouxu0811"; // 你的数据库密码

        String name = "admin";
        String pass = "admin123";

        Connection conn = null;
        PreparedStatement prep =null;
        ResultSet rs =null;

        int id = 0;
        String email = null;

        String sql = "select * from user where username = ? and password = ?";


        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection(url, username, password);

            prep = conn.prepareStatement(sql);
            prep.setString(1, name);
            prep.setString(2, pass);
            rs = prep.executeQuery();

            while (rs.next()){
                 id = rs.getInt(1);
                 email =  rs.getString(6);
            }


        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                rs.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                prep.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                conn.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }

        System.out.println(id);
        System.out.println(email);
    }
}
